Air filter



l 'atented Apr. 21, 1925.

LEWIS L. DOLLINGER, OF ROCHESTER, NEW YORK.

am FILTER.

Application filed January 30, 1924. Serial No. 689,438.

To all whom it may concern:

Be it known that I, LEWIS L. DOLLING-ER, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Air Filters, of which the following is a specification.

The object of this invention is to provide a new and improved construction for air filters used in connection with internal combustion engines, air compressors, etc.

This and other objects of this invention will be fully illustrated in the drawing, described in the specification and pointed out in the claims at the end thereof.

In the accompanying drawing:

Figure 1 is a side elevation of the filter partly broken away at each end thereof.

Figure 2 is an end elevation of the filter.

Figure 3 is a side elevation of a modified form of the air filter.

Figure 4: is a diagrammatic View of a motor, its carburetor and the air filter attached thereto.-

In the several figures of the drawings like reference numerals indicate like parts.

The air filter forming the subject matter of'my present invention is a modified construction of the air filters illustrated in my prior Patents 1,359,879 November 23rd, 1920; 1,457,351 June 5, 1923; 1,474,412 November 20th, 1923. Its function and use is the same as that described in connection with these patents except that the new construction provides for a different mounting of the air filter.

As illustrated in the figures of the drawings the air filter comprises the cylindrical shell 1 mounted in a horizontal position. Both of the ends of the cylindrical shell are closed. The left hand end of the shell is closed by the head 2 forming an integral part thereof. The right hand. end is closed by the head 3 which is clamped in place as will hereinafter be described. Centrally of the head 2 is formed the depression 4 form ing a cylindrical lug on the inside of the head. In line with this lug in the head 2 is the sleeve 45* supported centrally of the head 3 in the other end of the shell 1. This sleeve projects partially to the inside and partially to the outside of the head 3 and is suitably fastened thereto.

lVithin the sleeve 4 is mounted a yoke 5 having a'ball cup 6 formed on the outer end thereof. This cup is perforated in the middle and the under side thereof is provided with suitable prongs 7, 7 that are adapted to hold a nut 8 in back of the cup 6 and in line with the central opening provided therein. A tie rod 8 havingthe handle 9 formed on the outer end thereof is inserted into a hole formed in the depression 4 of the head 2 and passes through the cylindrical shell 1 until it strikes the cup shaped end of the yoke 5. The curved wall of the cup centers the end of the rod and directs it into the hole in the middle thereof so that the threaded end of the tie rodcan be threaded into the nut 8, mounted on the outside of the cup. In this way the yoke 5 and with it the sleeve 4 and head 3 are drawn toward the head 2 until the head 3, is firmly forced against the right hand of the shell 1 and closes" the end of the shell except for the outlet formed by the sleeve 4'.

Between the inwardly projecting lug 4 of the head 2 and inwardly projecting portion of the sleeve 4 is mounted the cylindrical screen 10. This screen forms the support of a series of filter units 11 that will now be described. As illustrated in section in Figure 1 each of the filter units comprises a hollow disc having slightly conical ends. These hollow discs are, formed up of a screen and the outside thereof is covered with a suitable filtering material. The opening in the middle of each disc or filtering unit at each end thereof is provided with a concentric flange 12 with which these units are supported on the cylindrical screen 10.

- The flanges of the filtering unit are formed so they will telescope into each other and bring the openings of all of the filtering units in line with each other in which position they are supported centrally within the shell 1 by the cylindrical screen 10.

As illustrated in the figures the cylindrical shell 1 is perforated by a series of openings arranged in parallel rows on each side of the shell. Theseopenings are located between the filtering units as illustrated in Figure 1 so that the air drawn into the shell enters the shell between the filtering units at'the point where the largest filtering area of the unit is exposed to it.

Each of the openings has an angular deflecting plate provided at the upper end thereof and projecting outwardly and down wardly therefrom. These deflecting plates prevent matter both solid and liquid from entering into the openings that drop on top or the sides of the shell of the filter. For this reason the deflecting plates of one side of the shell project downwardly on that side over the openings and the deflecting plates on the other side of the shell project downwardly on the other side over the openings. Al. the top of the shell no openings are provided because angular deflecting plates would have to practically close the openings at this point in order to deflect a ny fore1gn matter from them that will drop into the shell from above.

The filter illustrated in Figure 3 of the drawing is very similar to that described above and illustrated in Figures 1 and 2. There are a few differences One is that the tile rod directly threads into the cup.6 of the yoke 5 instead ofthreading into a nut located on the back of the cup. The other difference in the construction is the omission of the cylindrical screen 10 on which the filtering units are supported in the filter illustrated in Figure 1. Instead each of the filtering units has its flanges formed so that they will successively telescope into each other and support each other around the tie rod 8. Furthermore the openings in the filtering units and the flanges surrounding them gradually decrease in size making the outlet from the filtering units large at the outlet of the shell and comparatively small near the closed end thereof. In this construction the cylindrical boss formed in the closed end of the shell may be omitted providing only a small hole in this end for the tie rod 8 to pass therethrough.

In Figure 4 I have shown the air filter attached to the carburetor of a motor, reference numeral 30 indicating the motor and reference numeral '21 indicating the carburetor. t

I claim:

1. In an air filter the combination of a shell, a series of hollow discs made up of filtering material having central openings at each side thereof, said hollow discs being mounted within said shell Withtheir central openings in line with one another, inlets formed in said shell leading to the outside of said filtering units and an outlet provided in said shell from the central opening, of said filtering units.

2. In an air filter the combination of a shell, hollow disc filtering units mounted] within said shell, said filtering units having central openings at each side thereof being connected with each other and having a common outlet from said shell, said shell being ing provided With openings forming inlets to admit air to the outside of said hollow filtering units.

, 4. In an air filter the combination of a cylindrical shell mounted in a horizontal position, openings on each side of said shell,

deflecting plates projecting over the openings in said shell, the deflecting plates of the openings on one side of said shell pointing downwardly in on direction and the deflecting plates of the openings on the opposite side of the shellpointing downwardly in the other direction, a filtering unit mounted Within said shell.

5. In an air filter the combination of a cylindrical shell having one end thereof closed, a head adapted to close the other end of said shell, a sleeve provided centrally of said head, a yoke supported by said sleeve and projecting into shell, a tie rod connectin'g. said yoke with the closed end of said cylindrical shell and serving to clamp said head against the open end of said cylindrical shell, a filtering unit mounted within said shell and having its outlet through said sleeve.

6 In an air filter the combination of a se ries of filtering units each comprising a hollow disc having a central opening at each side thereof, an annular flange surrounding each of the openings in the sides of said filtering units, said flanges being adapted to telescope into one another and form a continuous series of self-supporting filtering units having a common outlet atone end thereof, a cylindrical casing surrounding said series of filtering units, said cylindrical casing having openings in the wall thereof to admit the air to said filtering units, an outlet in said cylindrical casing and means for supporting said series of filtering units at each end of said cylindrical casing and in line with said outlet in said cylindrical casing.

In testimony whereof I aflix my siguature.

LEWIS L. DOLLINGER. 

